package com.sias.common.utils;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;

/**
 * 网络工具类
 *
 * @author <a href="https://github.com/sogra">程序员sogra</a>
 */
public class NetUtils {

  /**
   * 获取客户端 IP 地址
   *
   * @param request
   * @return
   */
  public static String getIpAddress(HttpServletRequest request) {
    String ip = request.getHeader("x-forwarded-for");
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
      ip = request.getHeader("Proxy-Client-IP");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
      ip = request.getHeader("WL-Proxy-Client-IP");
    }
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
      ip = request.getRemoteAddr();
      if (ip.equals("127.0.0.1")) {
        // 根据网卡取本机配置的 IP
        InetAddress inet = null;
        try {
          inet = InetAddress.getLocalHost();
        } catch (Exception e) {
          e.printStackTrace();
        }
        if (inet != null) {
          ip = inet.getHostAddress();
        }
      }
    }
    // 多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
    if (ip != null && ip.length() > 15) {
      if (ip.indexOf(",") > 0) {
        ip = ip.substring(0, ip.indexOf(","));
      }
    }
    if (ip == null) {
      return "127.0.0.1";
    }
    return ip;
  }

}
